The 11th and 16th terms in a geometric sequence are 0.9130237 and 0.7522495, respectively. What is the sum of the first 84 terms in even numbered positions of the sequence (i.e. a2, a4, ..., a168)? Put your answer correct to seven decimal places.
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Please help. Feedback keeps saying answer, 79.97 (rounded), is incorrect.
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